Question

A sample of hard water on analysis
was found to contain 60PPM
MgSO4 then its degree of hardness​

Answer 1

Degree of Hardness is 50 ppm

Explanation:

MgSO₄ concentration = 60 ppm = 60 mg/lt

Molecular weight of MgSO₄ = 120

Valency = 2

Equivalent weight of MgSO₄ = 120/2 = 60

gram equivalent of MgSO₄ = gm equivalent of CaCO₃

Weight of MgSO₄/Equivalent weight of MgSO₄ = Weight of CaCO₃/Equivalent weight of CaCO₃

or, 60/60 = Weight of CaCO₃/100/2

or Weight of CaCO₃ = 50 mg

Thus, in 1 litre there are 50 mg as CaCO₃

Thus, concentration of MgSO₄ = 50 ppm as CaCO₃

Therefore, degree of Hardness of water = 50 ppm

Hope this answer is helpful.

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